package demo1;

public class Computer {
    public void powerOn(){
        System.out.println("电脑开机");
    }

    public void powerOff(){
        System.out.println("电脑关机");
    }

    public void usbService(IUSB iusb){
        iusb.openDevice();

        if(iusb instanceof Mouse){
            Mouse mouse = (Mouse) iusb;
            mouse.click();
        }else if(iusb instanceof KeyBoard){
            KeyBoard keyBoard = (KeyBoard) iusb;
            keyBoard.input();
        }

        iusb.closeDevice();
    }
}
